// index.html
;(function(win){
    var bodyStyle = document.createElement('style')
    bodyStyle.innerHTML=`body{width:1920px!important;}`
    document.documentElement.firstElementChild.appendChild(bodyStyle)
  
    function refreshScale(){
      let docWidth = document.documentElement.clientWidth;
      let docHeight = document.documentElement.clientHeight;
      var designWidth = 1920,
          designHeight = 1080,
          widthRatio = docWidth / designWidth,
          heightRatio = docHeight / designHeight; // 缩放比例
          document.body.style = "transform:scale(" + widthRatio + ");transform-origin:left top;"
     // 应对浏览器 全屏切换前后 窗口因短暂滚动条问题出现未占满情况
      setTimeout(function(){
        var lateWidth= document.documentElement.clientWidth,
          lateHeight = document.documentElement.clientHeight;
        if(lateWidth===docWidth) return;
  
        widthRatio = lateWidth/ designWidth
        heightRatio = lateHeight/ designHeight
        document.body.style = "transform:scale(" + widthRatio + ");transform-origin:left top;"
      },0)
    }
    refreshScale()
  
    win.addEventListener("pageshow", function (e) {
      if (e.persisted) { // 浏览器后退的时候重新计算
        refreshScale()
      }
    }, false);
    win.addEventListener("resize", refreshScale, false);
  })(window)
  